HIDRA I Working Group Activities
Within the HIDRA project three working groups were established. The Groups focus, respectively, on Scenario, Societal factors, and Protective measures. The activities of each group are described below.
Working Group 1: Scenarios
The objectives of Working Group 1 (WG1) are to identify a potential range of stylized scenarios to be considered with distinction between near surface and deep geologic disposal. It is also intended to identify considerations of the technical factors that may apply under site specific conditions and potential impacts of a scenario on the disposal system and environment (safety functions and FEPs), and exposure scenarios.
At the beginning of the activity, it was agreed to limit the number of potential human intrusion scenarios to that which could provide a reasonable range. Based on this concept, a list of human intrusion scenarios for radioactive waste disposal facilities were developed and six general classes of scenarios were identified. The WG will further focus on activities to describe technical considerations for each class of scenario in order to provide guidance on tailoring generic human intrusion scenarios to site specific human intrusion scenarios.
Working Group 2: Societal factors
The objectives of Working GRoup 2 (WG2) are to share, exchange information, and communicate good practices on:
- How societal factors can be used in selection of scenarios i.e. what societal aspects should be included and what are our recommendations regarding these aspects
- How to preserve knowledge throughout the life cycle of the radioactive disposal facility
- Effective communication of how human intrusion scenarios are used to build confidence in the safety of a radioactive disposal facility
The activity started from the identification and discussion on a number of societal factors related to Human Intrusion (HI) and how these can be included in HI scenarios and in communication of HI. There is a connection to the PRISM project and the WG is working to couple the text on societal factors to a concept figure of decision-making during the life cycle for safety case development developed under PRISM project, in order to visualize when different aspects of societal factors are important and how to communicate at different stages of the disposal facility.
The primary objective of Working Group 3 (WG3) is to provide protective measures that can be applied to counteract HI into the disposal system for radioactive waste. Those measures shall focus on the reduction of the potential for HI and/or the reduction of radiological consequences, if Human Intrusion occurs.
There is a general consensus that any measures taken to address potential HI must not compromise the safety performance of the disposal system. Therefore appropriate measures have to be derived or identified that shall contribute to the optimization of the disposal system against HI. The selection of protective measures and optimization is of particular emphasis for the underlying methodology of the HIDRA project.
An essential part of the work in WG3 is the establishment of a database of collected general measures that can be used as a starting basis. The identified potential measures constitute more or less a pre-selection of candidates from which the site- and design-specific protective measures can be selected. The derivation of optimization measures are part of the integration work. The integration involves the evaluation of the provided potential measures in the context of the scenarios and societal factors for a specific disposal facility and if these measures are ultimately suitable for the implementation.
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